Light bulb



FIG. 1 is a first perspective view of a light bulb showing the claimed new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plane view thereof; and,

FIG. 5 is a bottom plane view thereof.

The broken lines immediately adjacent to the claimed portions are boundaries, all other broken lines are environmental structures; all the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a light bulb, as shown and described. 